import './waves.css';

const context = '@@wavesContext';

function handleClick(el, binding) {
    function handle(e) {
        const customOpts = Object.assign({}, binding.value);
        const opts = Object.assign(
            {
                ele: el, // 波纹作用元素
                type: 'hit', // hit 点击位置扩散 center中心点扩展
                color: 'rgba(0, 0, 0, 0.15)', // 波纹颜色
            },
            customOpts
        );
        const target = opts.ele;
        if (target) {
            target.style.position = 'relative';
            target.style.overflow = 'hidden';
            const rect = target.getBoundingClientRect();
            let ripple = target.querySelector('.waves-ripple');
            if (!ripple) {
                ripple = document.createElement('span');
                ripple.className = 'waves-ripple';
                ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px';
                target.appendChild(ripple);
            } else {
                ripple.className = 'waves-ripple';
            }
            switch (opts.type) {
                case 'center':
                    ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px';
                    ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px';
                    break;
                default:
                    ripple.style.top = (e.pageY - rect.top - ripple.offsetHeight / 2 - document.documentElement.scrollTop || document.body.scrollTop) + 'px';
                    ripple.style.left = (e.pageX - rect.left - ripple.offsetWidth / 2 - document.documentElement.scrollLeft || document.body.scrollLeft) + 'px';
            }
            ripple.style.backgroundColor = opts.color;
            ripple.className = 'waves-ripple z-active';
            return false;
        }
    }

    if (!el[context]) {
        el[context] = {
            removeHandle: handle,
        };
    } else {
        el[context].removeHandle = handle;
    }

    return handle;
}

export default {
    bind(el, binding) {
        el.addEventListener('click', handleClick(el, binding), false);
    },
    update(el, binding) {
        el.removeEventListener('click', el[context].removeHandle, false);
        el.addEventListener('click', handleClick(el, binding), false);
    },
    unbind(el) {
        el.removeEventListener('click', el[context].removeHandle, false);
        el[context] = null;
        delete el[context];
    },
};
